Alright, let's solve this math problem step by step. First, we have the number 422. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 158. So, we're going to take the number 422 and add it to itself 158 times.
Step 1: 0 + 422 = 422
Step 2: 422 + 422 = 844
Step 3: 844 + 422 = 1266
Step 4: 1266 + 422 = 1688
Step 5: 1688 + 422 = 2110
Step 6: 2110 + 422 = 2532
Step 7: 2532 + 422 = 2954
Step 8: 2954 + 422 = 3376
Step 9: 3376 + 422 = 3798
Step 10: 3798 + 422 = 4220
Step 11: 4220 + 422 = 4642
Step 12: 4642 + 422 = 5064
Step 13: 5064 + 422 = 5486
Step 14: 5486 + 422 = 5908
Step 15: 5908 + 422 = 6330
Step 16: 6330 + 422 = 6752
Step 17: 6752 + 422 = 7174
Step 18: 7174 + 422 = 7596
Step 19: 7596 + 422 = 8018
Step 20: 8018 + 422 = 8440
Step 21: 8440 + 422 = 8862
Step 22: 8862 + 422 = 9284
Step 23: 9284 + 422 = 9706
Step 24: 9706 + 422 = 10128
Step 25: 10128 + 422 = 10550
Step 26: 10550 + 422 = 10972
Step 27: 10972 + 422 = 11394
Step 28: 11394 + 422 = 11816
Step 29: 11816 + 422 = 12238
Step 30: 12238 + 422 = 12660
Step 31: 12660 + 422 = 13082
Step 32: 13082 + 422 = 13504
Step 33: 13504 + 422 = 13926
Step 34: 13926 + 422 = 14348
Step 35: 14348 + 422 = 14770
Step 36: 14770 + 422 = 15192
Step 37: 15192 + 422 = 15614
Step 38: 15614 + 422 = 16036
Step 39: 16036 + 422 = 16458
Step 40: 16458 + 422 = 16880
Step 41: 16880 + 422 = 17302
Step 42: 17302 + 422 = 17724
Step 43: 17724 + 422 = 18146
Step 44: 18146 + 422 = 18568
Step 45: 18568 + 422 = 18990
Step 46: 18990 + 422 = 19412
Step 47: 19412 + 422 = 19834
Step 48: 19834 + 422 = 20256
Step 49: 20256 + 422 = 20678
Step 50: 20678 + 422 = 21100
Step 51: 21100 + 422 = 21522
Step 52: 21522 + 422 = 21944
Step 53: 21944 + 422 = 22366
Step 54: 22366 + 422 = 22788
Step 55: 22788 + 422 = 23210
Step 56: 23210 + 422 = 23632
Step 57: 23632 + 422 = 24054
Step 58: 24054 + 422 = 24476
Step 59: 24476 + 422 = 24898
Step 60: 24898 + 422 = 25320
Step 61: 25320 + 422 = 25742
Step 62: 25742 + 422 = 26164
Step 63: 26164 + 422 = 26586
Step 64: 26586 + 422 = 27008
Step 65: 27008 + 422 = 27430
Step 66: 27430 + 422 = 27852
Step 67: 27852 + 422 = 28274
Step 68: 28274 + 422 = 28696
Step 69: 28696 + 422 = 29118
Step 70: 29118 + 422 = 29540
Step 71: 29540 + 422 = 29962
Step 72: 29962 + 422 = 30384
Step 73: 30384 + 422 = 30806
Step 74: 30806 + 422 = 31228
Step 75: 31228 + 422 = 31650
Step 76: 31650 + 422 = 32072
Step 77: 32072 + 422 = 32494
Step 78: 32494 + 422 = 32916
Step 79: 32916 + 422 = 33338
Step 80: 33338 + 422 = 33760
Step 81: 33760 + 422 = 34182
Step 82: 34182 + 422 = 34604
Step 83: 34604 + 422 = 35026
Step 84: 35026 + 422 = 35448
Step 85: 35448 + 422 = 35870
Step 86: 35870 + 422 = 36292
Step 87: 36292 + 422 = 36714
Step 88: 36714 + 422 = 37136
Step 89: 37136 + 422 = 37558
Step 90: 37558 + 422 = 37980
Step 91: 37980 + 422 = 38402
Step 92: 38402 + 422 = 38824
Step 93: 38824 + 422 = 39246
Step 94: 39246 + 422 = 39668
Step 95: 39668 + 422 = 40090
Step 96: 40090 + 422 = 40512
Step 97: 40512 + 422 = 40934
Step 98: 40934 + 422 = 41356
Step 99: 41356 + 422 = 41778
Step 100: 41778 + 422 = 42200
Step 101: 42200 + 422 = 42622
Step 102: 42622 + 422 = 43044
Step 103: 43044 + 422 = 43466
Step 104: 43466 + 422 = 43888
Step 105: 43888 + 422 = 44310
Step 106: 44310 + 422 = 44732
Step 107: 44732 + 422 = 45154
Step 108: 45154 + 422 = 45576
Step 109: 45576 + 422 = 45998
Step 110: 45998 + 422 = 46420
Step 111: 46420 + 422 = 46842
Step 112: 46842 + 422 = 47264
Step 113: 47264 + 422 = 47686
Step 114: 47686 + 422 = 48108
Step 115: 48108 + 422 = 48530
Step 116: 48530 + 422 = 48952
Step 117: 48952 + 422 = 49374
Step 118: 49374 + 422 = 49796
Step 119: 49796 + 422 = 50218
Step 120: 50218 + 422 = 50640
Step 121: 50640 + 422 = 51062
Step 122: 51062 + 422 = 51484
Step 123: 51484 + 422 = 51906
Step 124: 51906 + 422 = 52328
Step 125: 52328 + 422 = 52750
Step 126: 52750 + 422 = 53172
Step 127: 53172 + 422 = 53594
Step 128: 53594 + 422 = 54016
Step 129: 54016 + 422 = 54438
Step 130: 54438 + 422 = 54860
Step 131: 54860 + 422 = 55282
Step 132: 55282 + 422 = 55704
Step 133: 55704 + 422 = 56126
Step 134: 56126 + 422 = 56548
Step 135: 56548 + 422 = 56970
Step 136: 56970 + 422 = 57392
Step 137: 57392 + 422 = 57814
Step 138: 57814 + 422 = 58236
Step 139: 58236 + 422 = 58658
Step 140: 58658 + 422 = 59080
Step 141: 59080 + 422 = 59502
Step 142: 59502 + 422 = 59924
Step 143: 59924 + 422 = 60346
Step 144: 60346 + 422 = 60768
Step 145: 60768 + 422 = 61190
Step 146: 61190 + 422 = 61612
Step 147: 61612 + 422 = 62034
Step 148: 62034 + 422 = 62456
Step 149: 62456 + 422 = 62878
Step 150: 62878 + 422 = 63300
Step 151: 63300 + 422 = 63722
Step 152: 63722 + 422 = 64144
Step 153: 64144 + 422 = 64566
Step 154: 64566 + 422 = 64988
Step 155: 64988 + 422 = 65410
Step 156: 65410 + 422 = 65832
Step 157: 65832 + 422 = 66254
Step 158: 66254 + 422 = 66676

So, 422*158 = 66676